<template>
    <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
      <!-- 卡片视图 -->
      <el-card>
        <!-- 警告区域 -->
        <el-alert
    title="添加商品信息"
    type="info"
    center
    show-icon :closanle="false">
  </el-alert>
  <!-- 步骤条区域 -->
  <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
    <el-step title="基本信息"></el-step>
    <el-step title="商品参数"></el-step>
    <el-step title="商品属性"></el-step>
    <el-step title="商品图片"></el-step>
    <el-step title="商品内容"></el-step>
    <el-step title="完成"></el-step>
  </el-steps>
  <!-- tab栏区域 -->
  <el-form :model="addForm" :rules="addFormRules" 
  ref="addForm" label-width="100px" label-position="top">
 <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
    <el-tab-pane label="基本信息" name="0">
        <el-form-item label="商品名称" prop="goods_name">
            <el-input v-model="addForm.goods_name"></el-input>
        </el-form-item>
        <el-form-item label="商品价格" prop="goods_price">
            <el-input v-model="addForm.goods_price" type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品重量" prop="goods_weight">
            <el-input v-model="addForm.goods_weight" type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品数量" prop="goods_number">
            <el-input v-model="addForm.goods_number" type="number"></el-input>
        </el-form-item>
        <el-form-item label="商品分类" prop="goods_cat">
            <el-cascader expand-trigger="hover"
           :options="catelist" :props="cateProps"
            v-model="addForm.goods_cat" @change="handleChange">
        </el-cascader>
        </el-form-item>
        
    </el-tab-pane>
    <el-tab-pane label="商品参数" name="1">
        <!-- 渲染item -->
        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
            <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox label="复选框 A" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                
              </el-checkbox-group>
        </el-form-item>
    </el-tab-pane>
    <el-tab-pane label="商品属性" name="2">商品属性</el-tab-pane>
    <el-tab-pane label="商品图片" name="3">商品图片</el-tab-pane>
    <el-tab-pane label="商品内容" name="4">商品内容</el-tab-pane>
  </el-tabs>
</el-form>
      </el-card>
    </div>
</template>

<script>
export default {
    data() {
        return {
            activeIndex:'0',
            // 添加商品表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],

            },
            // 添加商品的规则
            addFormRules:{
                goods_name:[
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price:[
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight:[
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number:[
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat:[
                    { required: true, message: '请输入商品分类', trigger: 'blur' }
                ]
            },
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[]
        };
    },

    created() {
        this.getCateList()
    },

    methods: {
        async getCateList(){
         const {data:res} = await this.$http.get('categories')
         if(res.meta.status !==200){
            return this.$message.error('获取商品分类数据失败')
         }
         this.catelist = res.data
         console.log(this.catelist)
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
              console.log(this.addForm.goods_cat)
              if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
              }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0' && this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
      async tabClicked(){
            // console.log(this.activeIndex)
            // 证明访问的是动态参数面板
          if(this.activeIndex==='1'){
          const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
          if(res.meta.status!==200){
            return this.$message.error('获取动态参数失败！')
          }
          console.log(res.data)
          res.data.forEach(item=>{
            item.attr_vals=
           item.attr_vals.length===0 ? 
           []:item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
            }

     
    },},
computed:{
    cateId(){
        if(this.addForm.goods_cat.length===3){
            return this.addForm.goods_cat[2]
        }
        return null
    }

}
}
  

</script>

<style scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
</style>